Isulan is a 1st class municipality in the province of Sultan Kudarat, Philippines. It is the provincial capital of the Province of Sultan Kudarat. According to the 2010 census, it has a population of 96,528 people.

Isulan is centrally located and is accessible to all neighboring towns not only within the Province of Sultan Kudarat Province but also in some municipalities of the Province of Maguindanao, South Cotabato and even that of Davao del Sur. It is bounded on the North by the Municipality of Esperanza, Northeast by the Municipality of Lambayong; on the East by Tacurong Municipality; on the South by the municipalities of Bagumbayan and Sen. Ninoy Aquino; on the Southeast by the municipality of Norala, South Cotabato; and on the West by the Municipalities of Lebak and Kalamansig. It has a total land area of 54,125 hectares.

The present territories of Isulan formerly belonged to the municipalities of Koronadal and Dulawan. The municipality of Koronadal was created under E.O. No. 82 dated August 8, 1947 by Pres. Manuel L. Roxas.

Sultan Kudarat is a province of the Philippines located in the SOCCSKSARGEN region in Mindanao. Its capital is Isulan and borders Maguindanao and Cotabato to the north, South Cotabato and Sarangani to the south, and Davao del Sur to the east, and the Celebes Sea to the west.

Sultan Kudarat was once a part of the former empire province of Cotabato. It was created as a separate province along with Maguindanao and North Cotabato on November 22, l973 by virtue of Presidential Decree No. 341 signed by former Pres. Ferdinand E. Marcos.

The purpose of dividing Cotabato into three (3) smaller provinces is clearly stated in Presidential Decree No. 341, which pertinently provided, to wit: “Whereas, the province of Cotabato is one of the largest and richest provinces of the Philippines;

Whereas, the potentials of the province have not been fully developed due to the magnitude of the task of provincial development and troubles that have long plagued the area;

Whereas, the many conflicting political, social and economic interests that have limited the progress of the province must be resolved in order to promote the stability and accelerate the development of Cotabato; and